On-line analysis and aid decision making method for low-frequency oscillation of electric power system
A low-frequency oscillation and decision-aiding technology, applied in electrical components, circuit devices, AC network circuits, etc., to achieve the effect of improving processing capacity and improving dynamic safety, stability and early warning capabilities
A low-frequency oscillation and decision-aiding technology, applied in electrical components, circuit devices, AC network circuits, etc., to achieve the effect of improving processing capacity and improving dynamic safety, stability and early warning capabilities
CN101557110AActive Publication Date: 2009-10-14NARI TECH CO LTD +1
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[0018] The method will be described in detail below in conjunction with the flow chart.
[0019] attached figure 1 Flowchart for the calculation of low-frequency oscillation early warning. figure 1 Step 1 in the above describes the data preprocessing, which is to perform data preprocessing on the actual measurement data of the monitoring equipment to form the input data for analysis and calculation. Data preprocessing includes data filtering and low frequency oscillation pre-judgment.
[0020] figure 1 Step 2 in the above describes that after data preprocessing, Prony analysis is used to obtain the oscillation mode characteristic quantity group, and the mode whose amplitude-frequency response is absolutely dominant is taken as the dominant oscillation mode characteristic quantity group of the oscillation curve.
[0021] figure 1 Step 3 in the middle describes judging the low-frequency oscillation state according to the dominant mode. The low-frequency oscillation alarm cr...
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The invention provides an on-line analysis and an aid decision making method for the low-frequency oscillation of an electric power system. According to information which is measured by a PMU and reflects the dynamic process of a power network, such as electric generator power angle, active power, busbar voltage phase angle, circuit active power, transformer active power, and the like, the invention monitors the low-frequency oscillation event of the power network online, identifies an oscillation mode and a strongly relevant machine set, counts participation factors, recognizes the approximate area of an oscillation center, and offers aid decision making information for restraining the oscillation on time. The invention conquers a problem that the analysis of the low-frequency oscillation is difficult since a power network model and a parameter are not exact, changes a situation that the low-frequency oscillation is lack of monitoring and analyzing method as well as can not be fast reacted in the past, and changes a situation that an exact judgment is hard to be made for the lack of the aid decision making method of the low-frequency oscillation in the past. Based on the safety pre-warning system and the aid decision making system of the low-frequency oscillation, important supports can be offered to power network operators for monitoring and analyzing the low-frequency oscillation feature of the power network and treating the low-frequency oscillation event.
Description
technical field [0001] The invention belongs to the field of electric power system and its automation technology. More precisely, the invention proposes a calculation method and a complete solution for low-frequency oscillation early warning, online analysis and auxiliary decision-making based on a wide area measurement system (WAMS) data platform. Background technique [0002] With the increase of load, the increase of power transmission distance, and the commissioning of a large number of high-voltage direct current (HVDC) and flexible AC control systems (FACTS), the dynamic characteristics of modern power systems are becoming more and more complex. At the same time, due to the increase in long-distance power transmission and grid interconnection, the problem of low-frequency oscillation is becoming more and more prominent, and weakly damped low-frequency oscillation is becoming a bottleneck that limits the transmission capacity of the interconnected grid. Fast and accurat...
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Patent Timeline
14 Oct 2009
Publication
CN101557110A
- IPC
- H02J3/00
- Inventors
- 徐泰山; 李文云